For mass adoption forget Segwit and Lightening, just increase the block size limit by 100 times.
Compensate the miners with a mining reward of new bitcoin transaction token when a block is found.
Miners will be happy and Bitcoin gets low transaction fees with ledger traceability.
Only downside is running a full node at home is more difficult.
You think if we made bitcoin less decentralized, it would make it more widely spread among individuals. I wouldn't say so. Because centralized systems we have today are more efficient, fast and convinient. Why switch even? Less decentralized systems like 100mb bitcoin block are slow, vulnerable, user-unfriendly and can be shut down by the authorities any time since there are only few full nodes in such system. It wouldn't be evolution of cryptocurrencies, but degradation. The only way for decentralized systems to become a substitute for centralized ones is reach the level of centralized systems in terms of efficiency, user experience, user interface, capacity, etc. But at the same time they should remain decentralized.